Toriko doesn't really replace Bleach as the third most popular manga in Jump.
Third place usually rotates around Bleach, Toriko, Beelzebub, Bakuman or Gintama. If I'm not wrong, Reborn, Sket Dance, Kuroko and others have also achieved third place before, so it's less of a Big 3, but Big 2 instead.
Obligatory.
Second. Fellas, now, when Bleach sunk (I hope for good), it is meaningless to still keep the Big Three title. You all know where the roots of that title lie. So I purpose we start new order - the Big One (or two, if you are a traitor) , good mangas, garbage and Bleach. There can't be 3rd because other good mangas get to 3rd or even 2nd place from time to time. While 1st is always occupied by Man Piece.
Or simply stop the Big Three talk. We all want a stabile graph, but I doubt that will work now.